Affiliation:
1. Moscow Aviation Institute (National Research University)
Abstract
This review presents a comprehensive analysis of the impact of tantalum alloying on the structure, heat resistance, and ablation resistance of ZrB2(HfB2)–SiC ultra-high-temperature composites. The influence of the primary phase content on the effects on the structural and morphological features of the oxide layers and their protective efficiency is analyzed. It is shown that alloying positively affects the composite's behavior by enhancing the viscosity and thermal stability of the glass phase, decreasing anionic conductivity, partially stabilizing the ZrO2(HfO2) lattice, and forming temperature-resistant complex oxides, such as Zr11Ta4O32 or Hf6Ta2O17 on the surface. It has been established that the alloying can have negative effects, including an increase in the liquid phase content, oxide film discontinuity, ZrO2(HfO2) grain damage due to TaB2 oxidation, or a significant amount of gas release due to TaC oxidation, as well as the formation of oxygen diffusion channels during the verticalization of Zr11Ta4O32 or Hf6Ta2O17 platelets. It is essential to note that the oxidation and ablation resistance, as well as the mechanisms driving composite behavior, differ depending on the alloying compounds and test conditions. Overall, this study sheds light on the role of tantalum alloying in enhancing the performance of ZrB2(HfB2)–SiC UHTC and highlights the importance of understanding the underlying mechanisms that govern their behavior.
Publisher
National University of Science and Technology MISiS
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